Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c89dafccc65387febee09eb1d2d0bd677ed720d45f823b77291ea0f350bb8d46' 
  AND token = 'VcCF5SJ9CjAUck4wm3vuhGbABCLUdh3NeV436Upl3pY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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