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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '745d52678c42ef10ae3c1704d313366fc9cb3888236b8eab1e66d2454a794f5d' 
  AND token = 'bs5IQxv8hvy4nBk2UwqZiUM1aJN5BbYpOeUr/GDwbi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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