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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '695fd05d5d138115e07a817fe32a165dc2cc9719eb1c324dbd760651d071cae3' 
  AND token = 'nVEE4lm06U8VskHhlupliLeJiOhNe28TkO8r/rHJRqA=' 
  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"
    }
  }
}