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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43363d2f69a2f669da3f48ebec8f776dc76c69ed48756563bd64ac80d8d06eb4' 
  AND token = 'BSqsZnQu6xwGE8Yupq7iTH/k9pJigjR3sN+77lh1pW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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