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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b852bb1c06d6cf7665a7b56f87f9e3ee37d3b8ae10a6092ba8595745ca56f7' 
  AND token = 'RRlxjKrN3jWWZT5lN5HGE9cS0OSiFijS6rZg0vHZztQ=' 
  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"
    }
  }
}