Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a424ff9a39641f0c6d677f7b4d644d96711eb710b595d77ad35ffc46ef8e4b51' 
  AND token = 'CfcoJSD9dtMPvys4Ja7CNVLQI/B6knHVA9Vhs7cMSqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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