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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0877c4ab67956e3e127ce6fee27f96b94aa73d5a9dee696d500ea619d0733e3' 
  AND token = 'Zifc5a+cEagtYrGOqKBO032P16pYtzs1/gYBDWs15+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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