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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5eb3349aa31336d11a743f04098a4e39857caa12ae6dc16ccb20221fdaf0858' 
  AND token = '3JjX0b9j5c7CmYTsA2A1MEQxo1Y4/yxQfeoeA3sRE54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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