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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb2acaf573dcafca7cd2dbcc45cc09b5fbaf1966e4bf1b0210fc35ef85c690f' 
  AND token = 'vXF1T3KTtcIW5iFuYfX2zdPvvi57xs6JJID0JRJhMfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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