Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdcc42caefac74bc0e7fd46abd5405886999aec617d877d20cc5feee283bf8f7' 
  AND token = '81M4FEMPrmnDVKzAjZMMZSdYMp/fOVHoD/cpTrao4Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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