Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1946b6b03175f842341da90b8af94c16e3743a9497f34ea174bd2bd5ae4cf6b7' 
  AND token = '75bX0w23UhZ0OhMdbqGkQO9dZTcNv4Ptrhjm0NW4mms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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