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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '852e5ac1dd849dbf3242c6d25cef661d9d1b25f151f900b057e78708289a4677' 
  AND token = '75fm7qieZuwJN71ykJwxW/XtGqgWhJSs8cP3Ju8P9pc=' 
  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"
    }
  }
}