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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd343d5885bbb4b0f0802c6f40052dc1cf9482eda6f48a3d52411122734d9ceb9' 
  AND token = 'eDEjWUl++HucqEyL9Cz1fG/lHOYz4cTz8NswlY8swY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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