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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1fbbb8c834c8be4951114a201d91c1fb53eed70d6291373fd278bc715db2c43' 
  AND token = 'NkCl7DpJ/3jrIyjmrgN1zOPxnc9gx430gt8WJp4VMSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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