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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1343317288c3624243e82a0b5db9c97a9c20c9bdad9a4492574b292868e11ef3' 
  AND token = 'Hlad0kAAc/gz69xlHr6xNRl6Le6rikCaKmFpBIkiC5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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