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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '201725eb9bc80f7fc972517da9342e4b1cb4f8791ad615a7d0db55d8c193abd8' 
  AND token = 'xp/3ddMUYq8XRsyZVwZRkM3FReusrnh40a/No7akCRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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