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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833c7737c810ae57774f318185716e8291eb1b119574a968b98e2f3e46661b86' 
  AND token = '7UiujgwsRvkG/WabpaoAzbCzkOOHPpZSkb/TtdR07fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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