Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71bd4e06331dd1030895a0c3aaab8b34a166e532ca73c351d366e67d52017aaa' 
  AND token = 'FgJAjzyX4ITkP7HvT4Km09dlpbPWgeXIIp34CHNpQY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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