Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74ad25e7dc5d4c9cde6e77c6d5d60cb6787a493f16e7a6abf71e95d413b5ff68' 
  AND token = '5m3ngeaRe8BFjT2Qsc6k+w7HPc2CKu+SiTCB8Hn+VaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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