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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cbd0f852a1f12e98967d96c20d5ee65e806b6342323271585dfc6363e5438e4' 
  AND token = 'gLjGM8i3Nxs6+iixafHf5ffKWNsrXU89xPbrtPaMlyk=' 
  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"
    }
  }
}