SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713ed5882875595421519329f26920960dc02e55bbff53a4b6e3c2f2a7711693' 
  AND token = '9x9wnlZ49DL7vgJ4/GHVup3nbPUe1qzbZr7gOAPsB84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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