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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b8b6844b1e026be71567f4e0865a614190e3011e3eb5b5fb0df231a7f789ceb' 
  AND token = 'B7RcdFp0tEfneAUxBsfSbVcNoqMbyI/sajkIj9lrTLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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