Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6749d72fda4e52ca88c9b7454d7c1bb348062569762f8a2a9776b17766c1e46a' 
  AND token = 'm9RA52tr4uUXIRsFqP5+5s5yH3fkeDFtTU3v2w9wyMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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