Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d2735eac734eed219015ae4fbde86e4a749b359ab7d6ce2f966f777cfc57a83' 
  AND token = 'NOH0erx+xISRfQdMfpdbvzTHS9DQHKXc2oPb51BaSDY=' 
  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"
    }
  }
}