Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bbea8a75c19ea776b977394d86ccda693302799ada77290b3143c86ea30625b' 
  AND token = 'YcySqvI31M1nrsVMCw0nzedtHYlOuZRtJkOnHIkqceo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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