Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ace8adc9ea30a128dcd3ad5210b682bfe72cf8a3e60e74ec07e63d8b8e810d2c' 
  AND token = 'Gl7BQuzb0Eg1vSXxYacNFElHS4U7JfD9BDZU4JRdCNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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