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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '365972ea47e4be1057798a3718d4abceb5cc532c9cf02620c858dcb41cf94c61' 
  AND token = 'AK8shc5HA0uu1hNNHT6QK4Uvcc9sQbXbCK2BkfK4q+c=' 
  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"
    }
  }
}