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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dfb5eb7b8a5d6d5c5e6a6e331e5e549809836f6738abdc1d33c499055b39e7f' 
  AND token = 'v8Bs/X+n32eW68swMPDaGWh8teJTuHizQCM15PIuxpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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