Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e44ff80c82c15e2b79bf431d57cfd9f4e47f85f417fa894d633d1a46c39bca63' 
  AND token = 'DSPLfQjSPpirgGtwcmfl3HoqgBnPkyDpr7Rawlf1a+Y=' 
  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"
    }
  }
}