Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e95c22fb733ede2361df7293434e31d6252c81816d42034c9b06db199c6f050' 
  AND token = 'd0EZ4KOXxno7mdvdtRhywb0MugvnLq/5SYgBOv++80c=' 
  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"
    }
  }
}