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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '440cefe82054bbf80a44b4d172a68849083bd96f708dec0bd84a74327f9c0213' 
  AND token = 'HM4Mb9VBADqu7ubezXvuJj0V6TW2f79g/NCpoD3Zz+c=' 
  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"
    }
  }
}