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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '035e9582538ba6cbef2ff103559fc935fffc6635ee80d2807cb5b9460f14af32' 
  AND token = 'IrlE83lhJ1hqmDxXnWTJ3EDlgOjDGHuh+7VNuX6/kKo=' 
  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"
    }
  }
}