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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19c16b838c3e062bc64f9bdcd6aaba123f059951b0f0ffe9d01f22480245c196' 
  AND token = '/z6TZNq2BkbLK/Ug5d4aafk79bO/i3KE+kLd+uIi5SE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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