Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ad34168809f60bc6945e05c612994716bdd99635c32d1ec8848d72ea27de96c' 
  AND token = '3f3dFxvUQNKhz9Oze8Ky4gDqHeGgAN42rmJu0Gi6oZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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