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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b95e07dc5e78179282a5d08f42672e82dff988fd7078bfdb5342e5d97d16261' 
  AND token = '3H8VXQ4d0jDE+aPVIQk9Y7RoZM9PIcF2MbIFxU7eeJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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