Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6d31cfaa1365cb7260c837a9bc0dfa302026de9972d2a747084aba55d6dbe7f' 
  AND token = 'VVaEAFTeL10jV2L8R+QCm2HYDoKJmhMBDhemplNQg0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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