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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a93df9e2b3596c71f36eb36e3101dbcbd88e2df09113293220657bc8b1a09269' 
  AND token = 'NLY55Lkb8FBMxCtlsqP7ZdNCDxmB2OvUTI1IZ64jm4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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