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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c54334ee5d1eeb3b9f22b6bf346443468f43b9b329b64e2b99fb5c1a942c180a' 
  AND token = 'rqkaotBdJVXUn4hH/RRPjjWQkoAbW3XyNR7AJaw78sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}