Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85200facad77d5bfe10b1bba1da23c9c453a09fcb71b69804ce50d14780d0756' 
  AND token = 'FqB696h2f0+UX1CyIpyospTOghn+R/7SQn3cYZnUqi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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