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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5fb1bc9d1517d76c2769b6f8d9dc5fea24296804a31fb9ee6f180ae8bd76fe9' 
  AND token = '+ArZY71jqIqE/kbHKjxNNDBxG0Q7EuEm9LrmiNLL/c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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