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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99868a869df6dfba9947793503498face0c0f02ab377bad1c984a35606733c37' 
  AND token = 't/Cf+puoIx6v8pIQaLINucqoo+yPpKY/cNy/oo0wO9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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