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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f96529d0c8ea9db0d6993a8b3ef1fcd96fff843145af20c294c95827fbd8601' 
  AND token = '6X1fHIIaPKcHLHxn4xF1vfV7IXONXjhj5lLm67YEt3Y=' 
  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"
    }
  }
}