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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '569f3e46974f7aee47cc44ee425c2aca35a7580643175c90dbcf7b2af0e4ade6' 
  AND token = '+FUW7cEKAtiID4hep6LF6+M6uwupa0Mk9wN6nXwaM+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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