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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79e56f400288e8630cd454f92fa2382a58803230eb437de3bb7d1d2090ce946d' 
  AND token = 'xiP14VFprVP3xWE9RClwBUD46TQzQVU9POpf6826JpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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