SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9357b821cc79656470090a75700728d9f579f69bc0d4dcee6649689eee1583ea' 
  AND token = 'kI/izn9zn8XblBwUZwYJLfhYQoDM/qymHaxn2g2y4/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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