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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2491f1d77979b7da5369d6e0f3a321add143c347194e5f9bb8c2e366eb4b9731' 
  AND token = 'rUc+20sLjqTyNNQX3XDc8L9YNl75IYz/mOqjJRPZiPY=' 
  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"
    }
  }
}