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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '422fc04e7d0cff49a6ae5c0856e6e19729ceb21f87100a679668d735088a8237' 
  AND token = '2yI0k9vrbag9qh2JRti9EWnntbqw2Rw/5F/8ykgbcbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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