Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d49a0b5aad8c3a50b72e299933c209e041ccee23706008c76ee044f74ff833' 
  AND token = 'eqsdSHCDXQiFlpmqEZ7V1lCvX1KZZO6VazcUk8/0sb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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