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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dfb3bb2c18aa0feb70e05b5487203956cbac21bc2338376dc5433dd95776714' 
  AND token = 'T14lTd5dnY3IuL43AKqWyFeyhTK0wbN30S6J/DmXwaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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