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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d1df01534f33ac79d2d332f2d8f7ea2e4d1618551fbde5891158587a5f8372c' 
  AND token = 'g7vleHTD9qI3yLbCVZk9GTOr5O5+9X/nBZ3m6J7k6Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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