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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3a67d93c138b00ef8b7e230f825c2c2ca31ed0a8e909c3e8a7e5ad9dfeec4f1' 
  AND token = 'o+FEW1ZdpUrX6wYZI5jQohSoYvzcY66At6OB2Ka1p7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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