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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33754e9bc01601f7ccd1f12a4eb4be06b923a55d018f18cdc4e69a3ec070216c' 
  AND token = 'j1LboqTRwg/xa+LXPJkvLjjso2TbFVgnh79+kH6N89c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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