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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a48d74e77d5b4b8b5b70fee126348b49a5b51d7ee84772313828ba2717b6b62' 
  AND token = '6WfKpze5EofXK/1KB63h17i4MvIm/Jqams98xL6VS3k=' 
  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"
    }
  }
}