SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ead13afb6d1bc079200b4fa5c155016d782d58b1feb2f03c3805d2737c4c6c07' 
  AND token = 'ViTJhBqRrb98XXuow5bf9vGjPAn8CCb8KvZ0QiFQXxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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