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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14e0aa67d3000d2648b11f8b006b98ec9dfbbd096bf49d830d0f6c57d02ae48f' 
  AND token = 'dFN3kaycZYE4P+FtNtmpVZo4gHOs+L+AInvi7wWZkYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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