Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a91f49406dfd0f19c82bd6be0944d583afa9d86ee5da92edff12580424fac45e' 
  AND token = 'jUOxqTHd6e8+h5kUR5gN+E3mmv2B12BVuMJmXMIOUb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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