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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b148cf6546b7419a3e3b7168ffac44ce1c86e5c455ccc5d2927e56b37a8fbd20' 
  AND token = '52sSHrKn7TzpUxOrreqyWinc/Lrk1x6f59syzbYpTzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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