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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20ae04e166688a85125b446af4f35da879d42fb0c3f8901a176e34893684726f' 
  AND token = 'HCM+6W/wXQhu1W7erdLCAg1xNM4qo5I/ULZhI9QZg3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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