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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b34d35ff2a339e034a46cd87e3baa9c20a9ce3d32677a33b6a15ffb2e2980697' 
  AND token = 'rqwby00YHdE9ePt74u/1QoRSrvim3BJc15onWqhJ2CA=' 
  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"
    }
  }
}