Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e57559905c2331de3b3391579ea3dd6ebaa4357997f76e1bf74a16cb901807' 
  AND token = '6lI3fNd7QnrGbRwEohw3xi3gCGdNoAsloYWnIKf+IEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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