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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760dea30a054fd46ec1bdce78d361713941a4c2b315b73bd2b40e60045741306' 
  AND token = '9+q77U6opZJVq/pogBGTqW5PKxneic5ZQBeoYMH5HEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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