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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1302a18c7ccc2f49e2395c3d2663684e07822f6f380b57cceb17685cef2ebc54' 
  AND token = 'iIK1h3eb9sQHr7zyGPHCcqRd7ibsZWrV1zts6oVqtKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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