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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdef1dc6d8357e031f379c99e978178271430947fac44009ac88a95b92c66180' 
  AND token = '+V9YtumGiIfkUrpy/GfAaX+OQynNQwjq1CNjOm7agxw=' 
  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"
    }
  }
}