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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10b20b8f914cdcb8631889efac7e58ca1db444937ba3a41d2b3c29492c9db84b' 
  AND token = 'O8ckDgRu1kqNPukdMvG9BQr4JHTZ1WnDLVtGeAvowPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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