Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b5f675e97e0ef38f6a07fe7f9f0b84526c3e3c3a1b04189083d6752346b2051' 
  AND token = '88bOu+IvA3GSPadK1PoG649vLsGT5Pt0iW9Ua4Xqnr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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