Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b24cd1bb62dfe164989f5d34e44eee409b77070a8150dcb8d67260e3b76facd0' 
  AND token = 'MD40QBrAHWcJ4qgapZ7Fnfit6prh6HRJbv4UK6gByNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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