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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '365c1d2c379cb97c99f8dfac99e0af440db9e630238581664f7dc61416994460' 
  AND token = '4wyRO90bTz+AQ5tP1yOheDMl4Wma2M8D1Y9X36/A6ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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