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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8da81de59556b330a4da8d8f5fbfd594f7345db0645f97bf40becaa57c5a606' 
  AND token = 'MqZj2nw1EQHIbPxBO0mcvKlfMeVjP9X8vVrucNnvLWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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