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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa277c1cfb9d3b88c60bd8bab43b04d14a251b18d6d4128007e797c83d57824e' 
  AND token = 'Bqn38A+2AvEEQrQpedQ0q5jTGL56PdAEwCfHqqm6w4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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