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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5498ee7bb7c4930fd78fed9461c2b5e5ea85df50736fdb39e88a9b3ba1782919' 
  AND token = '9AcPG6kd41yuCwrmWwz6B3y0O/khOGrdSUKL2NT/tvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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