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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f12202420a52ce28f1a8d37a90a222c691114baf6dbce81a7c08661da09b60dd' 
  AND token = '/FFHLiVc3LZwAr/ZWsvdQfFHcnmY4Hx0OQKF9enaWzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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