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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dde9e7235d3c1ec1c7e95b24d44bf221794cf1b65de7e5aa67f8ca56440dc09' 
  AND token = 'WFijioDVdyPvqGiNyDdiNws81fs1LJZcOjw4AKaKGxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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