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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e7a0cc48f5349b035d28742d2f6c5803f47b37ec68aae9cb88c517c960f9e15' 
  AND token = '2aaIAhiCE1IFvWXL8jUo0VTHsIPQczVXg8O3weFef5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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