Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b675d5c46cdef43bf694ddc6128b147f2fe16a36cd3a35c12a406076a10b2a21' 
  AND token = 'kYJH/g+UEUPeBcfm2rXy0gA312mueZU9XmYzbWiD6C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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